Torbanlea – Pialba Road Floodway Replacements Business Case


Department of Transport and Main Roads

Project value





Hervey Bay, Qld



The jointly funded $30 million upgrade, between Torbanlea and Hervey Bay, will upgrade an intersection and floodway along the  Torbanlea – Pialba Road (3.2 – 4.2 km, 4.8 – 5.5 km (Beelbi Ck) and 5.5 – 6.2 km). A business case has been produced for the preferred option for the upgrade of three floodways.

In 2017-2019, the Options Analysis and Business Case phases were completed for TMR.

In order to secure the funding associated with this project, additional planning and updated costing needed to be added into the business case. Replace the existing concrete floodway with reinforced concrete culverts to improve flood immunity during wet weather events. Bellwether were requested to perform the additional cost estimating service to update the business case.

What we delivered

Bellwether developed the P50/P90 Cost Estimate as per the TMR Project Cost Estimating Manual 7th Edition including:

  • Indirect Job Costs
  • Direct Job Costs
  • Owners Costs
  • Contingent & Inherent Risks
  • Probabilistic Determination of the base estimate to produce a P90

Bellwether Consulting worked collaboratively with the GHD to develop and update the Risk Profile Report together and provided a complete basis of estimate report.

“The updated cost estimates were in line with TMR’s expectations and were included in the Business Case”

Key outcomes

The client discussed this report with TMR and there were no issues raised. The updated cost estimates were in line with TMR’s expectations and were included in the Business Case.

The project will:

  • connect agricultural production regions to domestic and international markets
  • improve linkages for road-based tourism
  • improve connectivity between people with jobs and services
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Torbanlea – Pialba Road Floodway Replacements Business Case
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